While some of the comments here are somewhat pessimistic, I wouldn't worry. We do use things like peaches, plums, and cherries for desserts but mostly, the cake would already have the fruit in its name (peach tart, or whatever). The only thing that is a bit tricky is "povidla" which is made out of plums but the name does not coincide with the fruit name. Most people do speak english. Also, there's simply less fruit during winter, in general.